From: Ina&Laurean (ina.laurean@gmail.com)
Date: Tue Feb 10 2009 - 23:24:28 ARST
Subodh,
It is something related to Adventnet reporting, but I don't know if is
a problem with the product or it is caused by Netflow.
I am experiencing the same problem where the Netflow graph on
Adventnet shows much higher values than the SNMP reporting tool on the
same interface.
Laurean
On 2/10/09, subodh.rawat@wipro.com <subodh.rawat@wipro.com> wrote:
> Guys,
>
>
>
> Issue is that I am using Adventnet Netflow analyzer (Demo Professional
> Version). The speed graph has shown at time beyond 1Gbps speed (like
> 1.5Gbps, 2Gbps 2.2Gbps, 2.5 Gbps etc).
>
>
>
> I am confused if my link is only 1Gbps (even the hardware is Gigabit
> port), then how come Netflow Analyzer showing different result at time.
>
>
>
> Is it a bug in Adventnet OR their speed calculation method is different
> OR this is something related to Cisco Netflow?
>
>
>
> Please can someone answer this if you have faced this kind of issue?
>
>
>
> Many Thanks
>
> Subodh
>
>
>
> ________________________________
>
> From: paul cosgrove [mailto:paul.cosgrove@gmail.com]
> Sent: Tuesday, February 10, 2009 4:10 PM
> To: James MacDonald
> Cc: Subodh Singh Rawat (WT01 - ENERGY & UTILITIES);
> <ccielab@groupstudy.com>
> Subject: Re: throughput query on 1Gbps link
>
>
>
> If you wish to be compliant with 802.3 then a transmitting device should
> not use an interframe gap smaller than the time it takes to send 96
> bits. However there are cases where you may wish to do so. Intel used
> to use this on some of their EtherExpress NICs to allow for faster
> throughput (see http://en.wikipedia.org/wiki/Interframe_gap) and it is
> also used for RFC2889 compliance testing when deliberately overloading
> devices:-
> 5.6 Forward Pressure and Maximum Forwarding Rate
> ....
>
> 5.6.3.2 Minimum Interframe Gap
>
> .....
>
> Test frames SHOULD be transmitted to the first port (port 1) of the
> DUT/SUT with an interframe gap of 88 bits. This will apply forward
> pressure to the DUT/SUT and overload it at a rate of one byte per frame.
> The test frames MUST be constructed with a source address of port 1 and
> a destination address of port 2.
>
> The FR on the second port (port 2) of the DUT/SUT is measured. The
> measured Forwarding Rate should not exceed the medium's maximum
> theoretical utilization (MOL).
>
> A reduced interframe gap would not make any difference to passive DWDM
> equipment, it just sees a wavelength and passes it through.
>
> Paul.
>
>
>
>
> On Tue, Feb 10, 2009 at 1:45 PM, James MacDonald <j4m3sm63@yahoo.ca>
> wrote:
>
> I think maybe the app was calculating other test data as well either by
> config error or bug. Maybe send and recieve were combined somehow ... If
> you have a physical GigE port then you can only ever get 1Gbps
> bi-directional.
>
>
> James MacDonald
> E: jamesm@nevolutions.ca
> P: 416-580-6873
>
> The world is evolving ... is your network?
> Email info@nevolutions.ca to see how we can transform your network!
>
> On 9-Feb-09, at 10:47 AM, <subodh.rawat@wipro.com> wrote:
>
> Hi folks,
>
>
>
> Can you please let me know if a 1Gbps DWDM link can send data at more
> speed than 1Gbps?
>
>
>
> Thanks
>
> Subodh
>
>
>
>
>
>
>
>
>
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